Two full campaigns (hero and dark side), lots of challenges for those who wish to conquer the full game (180 emblems), mini-games, battle mode and chaos garden to enjoy. Sonic Adventure 2 is, however, a content rich game. There is clipping (as in the original), atrocious cameras (especially if you are a bit unsure of what direction you're heading next), and other graphical issues in there, but then again it's a game from 2001.
Your eyes may start tearing up when faced with some of the less than impressive textures this game has to offer.
The HD port looks reasonably good, especially the character models look clean and while aged, they won't bring tears to your eyes.